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beams (12 inches wide x 2 feet deep x 31-64 feet long), with a reinforced concrete slab between the grade <br />beams. Two concrete piers will be poured on either side of the foundation to provide for side-bracing of <br />the sound deflector/absorber structure. The sound deflector/absorber unit will be a fabricated curved steel <br />structure, lined with sound absorbing material, approximately 12 feet wide x 20 feet high x 45 feet long <br />• (along center-line of curvature). <br />Installation of the sound deflector/absorber unit will be on the existing NW Mains Ventilation Fan pad <br />and will not involve any new disturbance. The location and configuration of the unit is shown on Map 24 <br />and Figure 31. As a passive sound control device, the only required maintenance will involve periodic <br />inspection and cleaning. When the unit is no longer needed to control sound emissions from the <br />ventilation fan, it will be removed and will either be re-used elsewhere or salvaged. Foundations will be <br />demolished and removed in conjunction with demolitions and restoration of the ventilation fan installation. <br />• <br /> <br />TR07-61 2.05-45.9 07/14/07 <br />